/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.optimize.info;

import proguard.classfile.*;
import proguard.classfile.attribute.*;
import proguard.classfile.attribute.visitor.AttributeVisitor;
import proguard.classfile.util.SimplifiedVisitor;

/**
 * This AttributeVisitor marks all methods that catch exceptions.
 *
 * @author Eric Lafortune
 */
public class CatchExceptionMarker extends SimplifiedVisitor implements AttributeVisitor {
    // Implementations for AttributeVisitor.

    public void visitAnyAttribute(Clazz clazz, Attribute attribute) {}

    public void visitCodeAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute) {
        if (codeAttribute.u2exceptionTableLength > 0) {
            markCatchException(method);
        }
    }

    // Small utility methods.

    private static void markCatchException(Method method) {
        ProgramMethodOptimizationInfo.getProgramMethodOptimizationInfo(method).setCatchesExceptions();
    }

    public static boolean catchesExceptions(Method method) {
        return MethodOptimizationInfo.getMethodOptimizationInfo(method).catchesExceptions();
    }
}
